typos in manual

src/doc/doc/manual/layer_views.xml

@@ -77,7 +77,7 @@
     <li>Renaming a layer does not change the source - if you rename a layer to something like "1/0", you are likely to fool yourself thinking this is layer 1, datatype 0.</li>
     <li>Changing a layer view's source does not change the database too - it will just change the pointer. To change a layer's information in the database, use Edit/Layer/Edit Layer Specification.</li>
     <li>Deleting a layer from the layer list does <b>not delete</b> the layer from the database. Use Edit/Layer/Delete Layer instead.</li>
-    <li>Additing a new layer does not immediately create the layer in the database. Only once you draw something on that layer, it is generated in the database.</li>
+    <li>Adding a new layer does not immediately create the layer in the database. Only once you draw something on that layer, it is generated in the database.</li>
   </ul>
 
 </doc>

src/doc/doc/manual/net_tracing.xml

@@ -77,7 +77,7 @@
 
   <p>
   To configure the depth, enter the desired number of shapes in the 
-  "Trace depth" box at the bottom of the trace dialog. NOTE: the actual number of shapes in the net may be a litte
+  "Trace depth" box at the bottom of the trace dialog. NOTE: the actual number of shapes in the net may be a little
   less than the specified depth due to internal marker shapes which are taken into account, but are not delivered
   as parts of the net.
   </p>

src/doc/doc/manual/panels.xml

@@ -29,7 +29,7 @@
 
   <p>
   Choose "Pull In Other Layout" to combine other layouts already loaded into the
-  current panel. Basically, KLayout allows viewsing a layout in multiple panels, either
+  current panel. Basically, KLayout allows viewing a layout in multiple panels, either
   on its own in different configurations or together with other layouts. "Pull In Other Layout" 
   allows configuration of a panel to show another layout which has been loaded into another panel.
   In that sense it's the reverse of closing one layout from a panel showing multiple layouts.

src/doc/doc/manual/ruler_properties.xml

@@ -46,7 +46,7 @@
   <p>
   The "Label format" is an arbitrary text with embedded expressions that may represent a measurement
   value. Each such expression starts with a dollar sign, followed by the expression string. The expression 
-  syntax supportis the basic operations ("*", "/", "+", "-" ..), bitwise operations ("|", "&amp;", ..), 
+  syntax supports the basic operations ("*", "/", "+", "-" ..), bitwise operations ("|", "&amp;", ..), 
   the conditional operator ("x:y?z") as well as some functions, i.e. "abs", "sqrt", "exp". It includes a "sprintf" 
   function. These are some examples:
   </p>